Amorphous and crystalline calcium carbonate phases during carbonation of nanolimes: implications in heritage conservation
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F16%3A00462953" target="_blank" >RIV/68378297:_____/16:00462953 - isvavai.cz</a>
Result on the web
<a href="http://pubs.rsc.org/en/Content/ArticleLanding/2016/CE/c6ce01202g#!divAbstract" target="_blank" >http://pubs.rsc.org/en/Content/ArticleLanding/2016/CE/c6ce01202g#!divAbstract</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/c6ce01202g" target="_blank" >10.1039/c6ce01202g</a>
Alternative languages
Result language
angličtina
Original language name
Amorphous and crystalline calcium carbonate phases during carbonation of nanolimes: implications in heritage conservation
Original language description
Nanolimes are alcohol dispersions of colloidal Ca(OH)2 nanoparticles used as novel nanomaterials for the conservation of cultural heritage. Upon exposure to atmospheric CO2 at room T, and in the presence of H2O, they undergo carbonation forming CaCO3 cement which consolidates decayed porous materials such as stone or mural paintings. Despite extensive research on the synthesis and applications of nanolimes, little is known about the mechanisms and kinetics of the formation and transformation of metastable and stable calcium carbonate phases and their effects on the treatment efficacy. This is a strong handicap to their effective and widespread application. Here we show that the carbonation of nanolimes in humid air at room T involves the initial formation of amorphous calcium carbonate (ACC) and its transformation into metastable vaterite (and minor aragonite) via a dissolution-precipitation process, followed by non-classical nanoparticle-mediated crystal growth. Subsequently, vaterite (and aragonite) partially dissolves and stable calcite precipitates. All these phase transformations follow first order kinetics, where the rate controlling step is the amount of undissolved parent phase. We unambiguously demonstrate that precipitation of vaterite (up to ∼35 wt%) and aragonite (∼5 wt%) after ACC (up to ∼24 wt%) is favored by the alcohol adsorbed on Ca(OH)2 nanoparticles undergoing carbonation. Although it is known that vaterite formation limits consolidation, the fast kinetics of the solvent-mediated vaterite-calcite transformation (72% conversion in ten days) ensures that, in the short-term, the almost full consolidation potential of nanolimes can be achieved. Finally, the mechanistic and kinetic commonalities between nanolime carbonation and biomineralization/biomimetic synthesis of CaCO3 underline that the observed multistep crystallization and non-classical crystal growth might be general and applicable for the rational design of novel CaCO3 materials.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
AL - Art, architecture, cultural heritage
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
CrystEngComm
ISSN
1466-8033
e-ISSN
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Volume of the periodical
18
Issue of the periodical within the volume
35
Country of publishing house
GB - UNITED KINGDOM
Number of pages
14
Pages from-to
6594-6607
UT code for WoS article
000382682700006
EID of the result in the Scopus database
2-s2.0-84984813315